Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 187)

Publication 1785-UM012D-EN-P - July 2005
Communicating with Devices on an Ethernet Network 11-13
Using BOOTP to Configure Channel 2 for Controllers on Subnets
Configure the BOOTPTAB file according to the subnet mask and gateway
address for each PLC-5E controller on the link. See the example below and the
corresponding BOOTPTAB file on the next page.
IMPORTANT
Because BOOTP requests are seen only on the local
subnet, each subnet needs its own BOOTP server and
BOOTPTAB file.
Ethernet gateway
or router"
PLC-5/20E
processor
Ethernet TCP/IP network
personal computer WINDOWS
or HP 9000 or VAX computer
PLC-5/80E
processor
Hostname: Iota2
IP address: 130.151.132.110
Subnet Mask: 255.255.255.0
Gateway
Address: 130.151.132.1
PLC-5/20E
processor
Hostname: Iota3
IP address: 130.151.138.123
Subnet Mask: 255.255.255.0
Gateway
Address: 130.151.138.1
Hostname: Iota1
IP address: 130.151.194.19
Subnet Mask: 255.255.255.0
Gateway Address: 130.151.194.1
130.151.194.xxx
130.151.132.xxx 130.151.138.xxx
Subnet A
Subnet B Subnet C
BOOTP
server
BOOTP
server BOOTP
server
130.151.132.1 130.151.138.1
130.151.194.1